WASHINGTON - Police and federal agents pulled the car over in a suburb north of Denver. An FBI agent showed his badge. The driver appeared not startled at all. "My friend," he said, "I have been waiting for you."

And with that, Jesus Audel Miramontes-Varela stepped out of his white 2002 BMW X5 and into the arms of the Federal Bureau of Investigation.

Over the next several days at his ranch in Colorado and an FBI safe house in Albuquerque, the Mexican cartel chieftain - who had reputedly fed one of his victims to lions in Mexico - was transformed into one of the FBI's top informants on the Southwest border.